They travel from Pittsburgh to Washington. The game ends at maybe 9:30 PM on May 8, and the next game starts 7 PM on May 9. They have to be there much earlier, of course. Between when they leave the arena and enter the next one, there's maybe 16 hours?
In contrast, Denver and Dallas in the NBA played Game 2 in Denver on Tuesday night. Game 3 is Saturday at 5 PM. Three full days off.